Tailoring the electron and hole Landé factors in lead halide perovskite nanocrystals by quantum confinement and halide exchange

Abstract

The tunability of the optical properties of lead halide perovskite nanocrystals makes them highly appealing for applications. Both, halide anion exchange and quantum confinement pave the way for tailoring their band gap energy. For spintronics applications, the Landé g-factors of electrons and hole are of great importance. By means of the empirical tight-binding and $\text{k}\cdot \text{p}$ methods, we calculate them for nanocrystals of the class of all-inorganic lead halide perovskites CsPb$X_3$ ($X=\text{I},\text{Br},\text{Cl}$). The hole g-factor as function of the band gap follows the universal dependence found for bulk perovskites, while for the electrons a considerable modification is predicted. Based on the $\text{k}\cdot \text{p}$ analysis we conclude that this difference arises from the interaction of the bottom conduction band with the spin-orbit split electron states. The model predictions are confirmed by experimental data for the electron and hole g-factors in CsPbI3 nanocrystals placed in a glass matrix, measured by time-resolved Faraday ellipticity in a magnetic field at cryogenic temperatures.

References in corpus (7)

• Universal behavior of the electron g-factor in GaAs/AlGaAs quantum wells
• Pump-Probe Faraday Rotation and Ellipticity in an Ensemble of Singly Charged Quantum Dots
• The Landé factors of electrons and holes in lead halide perovskites: universal dependence on the band gap
• Coherent Spin Precession and Lifetime-Limited Spin Dephasing in CsPbBr3 Perovskite Nanocrystals
• Mode locking of hole spin coherences in CsPb(Cl,Br)${}_3$ perovskite nanocrystals
• Tight-binding description of inorganic lead halide perovskites in cubic phase
• Effective Landé factors of electrons and holes in lead chalcogenide nanocrystals

Cited by in corpus (4)

• Giant optical orientation of exciton spins in lead halide perovskite crystals
• Confined acoustic phonons in CsPbI3 nanocrystals explored by resonant Raman scattering on excitons
• Quantum beats of exciton-polarons in CsPbI3 perovskite nanocrystals
• Untangling the valley structure of states for intravalley exchange anisotropy in lead chalcogenides quantum dots